Used in peptide synthesis as a protected amino acid derivative, enabling selective coupling reactions while preventing side reactions at the tyrosine hydroxyl group. The Boc group protects the alpha-amino function, while the benzyl group shields the phenolic hydroxyl, allowing stepwise assembly of complex peptides. Commonly applied in solid-phase and solution-phase synthesis of bioactive peptides, including those used in pharmaceutical research and development. Its protecting groups can be selectively removed under mild conditions, making it suitable for multi-step synthetic strategies.